edison



(No Model.) Y

T. A. EDISON.

. PHONOGRAPH.

No. 454,942. Patented June 30, 1891..

/\ www.

-gzJV 1////////////////,.

@vom Sx. @3% uw an UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF LLEVVELLYN PARK, NEV JERSEY.

PHONOGRAPH.

SPECIFICATION forming part f Lettels Patent N0. 454,942, dated J' une 30, 1891.

Application iiled J'nly 30, 1890. Serial No. 360,346. (No model.) I

- To all whom t may concern:

Be it known that I, THOMAS A. ED1soN,.a citizen of the United States, residing at Llewellyn Park, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Phonographs, (Case No. 866,) of whichV the following is a specication.

The object of the present invention is t0 provide a construction in which motion imparted to a phonograph-diaphragm by sound'- wavesf'shall be transmitted correctly and unimpaired to the recorder, and conversely in which all movements of the reproducer caused by the phonogram-record shall be transmitted to the diaphragm; and the invention consists in a tension-sprin g for the recorder and reproducer carrying arm, said arm being connected to the diaphragm, substantially as hereinafter described and claimed.

In the accompanying drawing, which illustrates the invention, the .iigure is a central section of a phonograph recorder or reproducer, with the operatingpoints and the means by which the same are connected to the diaphragm and the tension-spring shown in elevation.

l is a section of the arm which carries the recorder and reproducer and which is usually sleeved on the guide-rod and connected through the sleeve to the guide or feeding arm, as is well understood in this class of instruments. t

2 is a projecting tube, to which a speaking or hearing tube may be attached in the usual manner.

3 is a diaphragm, to the center of which is attached a post 4.

5 is a link or a wire having a hook at each end extending from a hole in post 4 to a hole near one end of lever 6, whose pivot is carried by the weight or retarding device 12, which carries the recorder 7 and the reproducer.

8 is a second link or similar device on the opposite side of the pivoted lever 6. In this link bears one end of a tension-spring 9, which is sup ported on the stationary post 10. It will be understood that the movement of weight 12 is limited in both directions by the projection at its outer end, which strikes against the iianges or heads of post 10.

l1 is a phonogram-blank.

In using the apparatus above described the spring 9 serves to throw the lever 6 away from the diaphragm and to keep the loose or jointed connection between the diaphragm and lever Having thus described the invention, what I I claim isl. The combination, in a phonograph, of a pivoted operating-point, a yielding link connection between the point and the diaphragm, and a spring acting on the point, substantially as described.

2. The combination of a phonograph-dia phragm, a post on the diaphragm, a pivoted recorder or reproducer, a link forming a yielding connection between said post and recorder or reproducer, and a spring the tension of which moves the recorder or reproducer arm forward when the diaphragm moves forward, substantially as described.

3. The combinatiomin a phonograph, of an operatingpoint connected with a diaphragm by a loose or flexible connection, and a spring supported independently of the diaphragm, acting on said point and preventing lost motion, substantially as described.

4. The combination, in a phonograph, of a diaphragm, anoperating-point supported on a weight and connected to the diaphragm, and a spring acting on the point to prevent lost motion, substantially as described.

5. The combination, in a phonograph, of an operating-point pivoted and connected to the diaphragm by a loose or jointed connection, the link or similar device and the spring acting on the operatingpoint through said.

link and in opposition to the diaphragm, substan'taiiy as described.

6. The combination, in a phonograph, of an through a loose or yielding connection, substantiaiiy as described. Io

This specification signed and witnessed this operating-point pivotaily connected to the re- 5th day of July, 1890. 5 tarding plate or block and having a jointed connection With the diaphragm, and a spring Witnesses: supported on a fixed part of the apparatus T. E. COURAN, and pressing against the operating point W. PELZER.

THOS. A. EDISON. 

